JPH11206038A - PV system interconnection network system - Google Patents

Abstract

(57) [Problem] To provide a photovoltaic power generation system interconnection network system capable of ensuring higher security and service by connecting an interconnection inverter device and a predetermined external business operator via a communication line. . A control circuit automatically opens a switch based on abnormality detection to disconnect a connection between a solar cell array and an inverter circuit and a connection between the inverter circuit and a distribution board. At the same time, telephone line 50 from NCU 43
The error information is transmitted to the service company 60 via. The service company immediately dispatches a serviceman to the user's home for maintenance and repair. The management company 80 accesses the user's home via the telephone line 50 and collects operation information of the interconnection inverter device 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power generated by a solar cell array, which is led to an inverter circuit to convert the AC power into AC power, and the AC power is supplied from a distribution board to a load.
The present invention relates to an interconnected inverter device that sells power to a commercial system, and a solar power generation system interconnected network system that manages the interconnected inverter device via a communication line under a predetermined business operator.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a schematic configuration of a conventional general residential photovoltaic power system interconnection system. In FIG. 8, reference numeral 11 denotes a solar cell array, which is configured by connecting a plurality of solar cell strings in which solar cell modules each including a photoelectric conversion element are connected in series. Reference numeral 12 denotes a DC connection box connected to the output side of the solar cell array 11, which is configured by a diode or the like so that the output from the solar cell array 11 does not flow backward. 1
Reference numeral 3 denotes an inverter circuit for converting DC power input from the DC junction box 12 into AC power synchronized with the commercial power supply, and 14 denotes an inverter circuit 13 for maximizing the output.
Is a control circuit for switching the input and output of the inverter circuit 13. The inverter circuit 13, the control circuit 14, and the switch 15 constitute an interconnection inverter device 16, and the solar cell array 11, the DC connection box 12, and the interconnection inverter device 16 constitute a solar power generation system 17. I have. Reference numeral 18 denotes a commercial system which is a power system of a commercial power supply, 19 denotes a system breaker interposed in the commercial system 18, 2.
0 is a pole transformer, 21 is a service line, 22 is a circuit breaker, 2
Reference numeral 3 denotes a power meter, 24 denotes a distribution board connected to the power meter 23 and also connected to the inverter circuit 13 via the switch 15, and 25 denotes an indoor load. The wattmeter 23 has two built-in ones for power purchase and for power sale.

In the photovoltaic power generation system interconnection system configured as described above, the photovoltaic power generation system
When the solar cell array 11 receives sunlight and starts generating electricity at sunrise, the control circuit 1
4 automatically starts the operation of the inverter circuit 13, and when the output of the solar cell array 11 decreases at sunset, the operation is automatically stopped, and the power is automatically cut off at night. The DC power generated by the solar cell array 11 in response to the sunlight is supplied from the switch 15 of the interconnection inverter device 16 to the inverter circuit 13 via the DC connection box 12. The inverter circuit 13 converts the DC power input under the control of the control circuit 14 into AC power synchronized with the commercial power system 18. The AC power generated by the inverter circuit 13 is supplied to the switch 1
5 to the distribution board 24, and further from the distribution board 24 to the indoor load 25.

In a state where the AC power generated by the inverter circuit 13 cannot cover the power consumption of the indoor load 25, the shortage is transferred from the commercial system 18 via the distribution board 24 to the indoor load 25.
To supply. On the contrary, the inverter circuit 13
When generating AC power that exceeds the power consumption in 5,
Reverse power flows from the distribution board 24 to the commercial system 18, and the power company 26
Can be sold to

When the system breaker 19 opens in the commercial system 18 and a power loss occurs, it is necessary to disconnect the photovoltaic power generation system 17 from the commercial system 18. This is because the maintenance of the commercial grid 18
This is because if the electric power from the power supply flows into the commercial system 18, the maintenance worker may encounter an electric shock accident. Therefore, when detecting the loss of power, the power company 26 sends a control signal to the circuit breaker 22 to perform a transfer cutoff for cutting off the circuit breaker 22.

In long-term use, the photovoltaic power generation system 17 may fail and become inoperable. The solar power generation system 17 may become inoperable due to an abnormality in the commercial system 18.

If the resident is not aware of this, the outage will last for a long time. It's easy for a service company to go unnoticed until they check it regularly. Depending on the nature of the failure, the internal circuit voltage becomes abnormally high, which may cause a danger such as a fire.

Therefore, in the solar power system interconnection system shown in FIG. 8, the control circuit 14 of the interconnection inverter device 16 has a function of detecting a failure, and the alarm 2
7 is connected to activate the alarm 27 based on the failure detection. The alarm 27 is installed indoors. The resident who has heard the alarm notifies the service company by telephone, and the worker dispatched from the service company performs inspection and repair, thereby preventing occurrence of danger and restarting the operation of the solar power generation system 17. Become like

A photovoltaic power generation system interconnection system has been proposed which automatically reports an abnormality of the photovoltaic power generation system 17 to a power company or the like via a public telephone line. It is shown in FIG. 9, the same reference numerals as those in FIG. 8 denote the same elements, and a description thereof will not be repeated. A line control circuit 28 is connected to the control circuit 14, and the line control circuit 28 is connected to a central management system 30 in a power company 26 or a security company via a telephone line 29. When the control circuit 14 detects an abnormality in the photovoltaic power generation system 17, the control circuit 14 controls a line control circuit 28 to send an abnormality signal to the central management system 30 via the telephone line 29.
Send to Electricity companies or security companies dispatch workers to perform maintenance and repairs.

[0010]

In the conventional method shown in FIG. 8, a warning is issued only to the resident at the user's house. The photovoltaic power generation system 17 continues to operate in an abnormal state, and security is not ensured.

In the conventional method shown in FIG. 9, the interconnection inverter 16 itself cannot be remotely controlled, and the interconnection inverter 16 cannot be stopped immediately upon receiving an abnormal signal.

The present invention has been made in view of such circumstances, and secures higher security and service by connecting an interconnection inverter device to a predetermined external business operator through a communication line. It aims to provide a photovoltaic power system interconnection network system that can be used.

[0013]

According to a first aspect of the present invention, there is provided a photovoltaic power system interconnection network system, comprising: an inverter circuit for converting DC power generated by a solar cell array into AC power; and controlling the inverter circuit. The basic configuration of the interconnected inverter device is provided with a control circuit for performing the operation and a switch interposed between the solar cell array and the inverter circuit and between the inverter circuit and the distribution board. A transmission / reception unit such as an NCU connected to a communication line such as a telephone line is connected to the control circuit, and the control circuit opens a switch when an abnormality of the solar cell array or the interconnection inverter device is detected. Thus, the entire string constituting the solar cell array is cut off from the inverter circuit and the inverter circuit is cut off from the distribution board. Further, the transmission / reception unit is configured to transmit error information to a predetermined business entity via a communication line.

In the above configuration, the control circuit detects when the interconnected inverter device becomes abnormal and automatically opens the switch to ensure immediate security. Further, since error information is automatically and in real time reported from a user's home to a predetermined company such as a service company via a communication line, maintenance and repairs are immediately carried out.

According to a second aspect of the present invention, there is provided a photovoltaic power generation system interconnection network system, comprising: an inverter circuit for converting DC power generated by a solar cell array into AC power; a control circuit for controlling the inverter circuit; The basic configuration of the interconnection inverter device includes a switch interposed between the battery array and the inverter circuit and between the inverter circuit and the distribution board. A transmission / reception unit such as an NCU connected to a communication line such as a telephone line is connected to the control circuit, and a predetermined business operator accesses the control circuit of the interconnection inverter device via the communication line to connect to the interconnection circuit. The configuration is such that the operation information of the inverter device is collected by a predetermined company.

According to the above configuration, a predetermined company such as a management company periodically or irregularly collects the operation information of the interconnection inverter device at the user's home via the communication line, and detects the fluctuation of the power generation amount. In order to confirm and check for signs of abnormalities,
Higher levels of security and services are provided.

According to a third aspect of the present invention, there is provided a photovoltaic power system interconnection network system, comprising: an inverter circuit for converting DC power generated by a solar cell array into AC power; a control circuit for controlling the inverter circuit; The basic configuration of the interconnection inverter device includes a switch interposed between the battery array and the inverter circuit and between the inverter circuit and the distribution board. A transmission / reception unit connected to a communication line such as a telephone line is connected to the control circuit, and when an abnormality occurs in the commercial system, a control circuit of the interconnection inverter device is transmitted from the predetermined company via the communication line. To access and control the inverter circuit including stoppage.

According to the above configuration, when the abnormality occurring in the commercial system is dangerous, the inverter circuit is stopped by remote control via a communication line by a predetermined company such as a power company, so that high security is ensured. .

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a photovoltaic power generation system interconnection network system according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a photovoltaic power generation system interconnection network system according to an embodiment. An inverter circuit 13 is connected to a solar cell array 11 in which a plurality of solar cell strings are connected in parallel via a DC connection box 12 for backflow prevention and a switch 15. The inverter circuit 13 is controlled by the control circuit 14 and converts the input DC power into AC power synchronized with the commercial power supply. The interconnection inverter device 16 includes an inverter circuit 13, a control circuit 14, and a switch 15.
And the entirety of the interconnection inverter device 16, the solar cell array 11, and the DC connection box 12
7 are configured. Reference numeral 18 denotes a commercial power system serving as a commercial power supply, 19 denotes a system breaker, 20 denotes a pole transformer, 21
Is a service line, 22 is a circuit breaker interposed in the service line 21, 23 is a power meter, 24 is a distribution board, 25 is an indoor load,
Reference numeral 6 denotes a power company.

Each solar cell string of the solar cell array 11 is provided with a sensor 41 for temperature, disconnection, leakage, and other necessary sensors, and each part of the inverter circuit 13 is provided with a sensor 42 for temperature, disconnection, overcurrent, safety circuit, etc. And the sensors 41 and 42 are connected to the control circuit 14. The interconnection inverter device 16 is an NCU as a transmission / reception unit.
(Network control unit) 43, and the control circuit 14 is connected to the telephone line 50 via the NCU 43. 44 is a telephone.

The control circuit 14 of the photovoltaic power generation system 17 is connected to a main service company 60, a management company 80, and a power company 26 via a telephone line 50. The main service company 60 has jurisdiction over a wide area, and the jurisdiction is divided into a plurality of areas, and a service company 70 is established for each area. The main service company 60 is N
CU 61, computer 62, database server 6
3, a facsimile machine 64 and the like. The service company 70 at each base is provided with a facsimile machine 71 and a computer 72. The management company 80 is provided with a network server 81. In the power company 26, a computer 92 is connected to the telephone line 50 via an NCU 91.

The control circuit 14 in the interconnection inverter device 16 monitors the state of each part of the photovoltaic power generation system 17 based on signals from the sensors 41 and 42. When the control circuit 14 detects an abnormality, the control circuit 14 sends a control signal to the switch 15 to open the switch 15, disconnects the connection between the solar cell array 11 and the inverter circuit 13, and switches the inverter circuit 13 and the distribution board 24. Disconnect from the connection. That is, the entire string forming the solar cell array 11 is turned off, and the interconnection between the inverter circuit 13 and the commercial system 18 is turned off. Further, the control circuit 14 activates the NCU 43 and transmits error information together with ID information to the telephone line 50.
To the main service company 60 via. The computer 62 of the main service company 60 searches the database server 63 based on the received information, extracts user information (name, address, telephone number, etc.), activates the facsimile machine 64, and retrieves the user information and error code. Facsimile transmission is automatically performed on-line to the facsimile machine 71 of the service company 70. Alternatively, it automatically communicates online with the computer 72 of the nearest service company 70. The service company 70 dispatches a serviceman to the user's home to perform maintenance and repair.

The management company 80 accesses the interconnection inverter device 16 at the user's home from the network server 81 via the telephone line 50 periodically or as needed.
Operation information such as the operation mode, power generation amount, and error code of the interconnection inverter device 16 is collected. This access is performed with no ringing. The collected information is used as accumulated data on the basis of operation of the management company 80. When the amount of power generation is extremely small, the management company 80 goes directly to the user's house to perform maintenance or notifies the main service company 60.

When an accident or the like occurs in the commercial power system 18, the power company 26 connects the computer 92 to the NCU 91, and remotely controls the control circuit 14 of the interconnection inverter 16 via the telephone line 50 and the NCU 43. Emergency stop of the interconnection inverter device 16,
Alternatively, the vehicle can be put on standby or driven according to the situation.

FIG. 2 is a flowchart showing a schematic operation of the control circuit 14 in the interconnection inverter device 16.
In the main routine of the control of the inverter circuit 13 by the control circuit 14, the data of the power generation amount is input, the accumulated value is updated, and the history data of the power generation amount is generated (S1).
1). Further, the state of the sensors 41 and 42 is input and stored as a history (S12). It is determined whether an abnormality has occurred (S13). If there is no abnormality, the process returns to a predetermined step (not shown) of the main routine (S19).
When there is an abnormality, a control signal is output to the switch 15 to turn off the switch 15 (S14), and the inverter circuit 13 is stopped (S15). Then, the NCU 43 is activated (S16), dials the main service company 60 (S17), and transmits ID information and error information from the NCU 43 to the main service company 60 via the telephone line 50 (S18).

FIG. 3 is a flowchart showing a schematic operation of the computer 62 in the main service company 60. Waiting for the detection of the incoming signal (S21), the telephone line 50
Then, the ID information and error information transmitted via the server are acquired (S22). After detecting the end signal (S23), the database server 63 is searched based on the acquired ID information to extract user information such as name, address, and telephone number (S24). The telephone number of the nearest service company 70 is determined based on the extracted user information (S2).
5). The facsimile apparatus 64 is activated (S26), dials with the determined telephone number (S27), and facsimile transmits user information and an error code to the facsimile apparatus 71 of the nearest service company 70 (S2).
8). After detecting the transmission end signal (S29), the operation ends.

FIG. 4 is a flowchart showing a schematic operation of the network server 81 of the management company 80, and FIG. 5 is a flowchart showing a schematic operation of the control circuit 14 of the interconnection inverter device 16 for access from the network server 81.

As shown in FIG. 4, the network server 8
1 obtains the user's home telephone number by periodic database search (S31), dials the telephone number without ringing (S32), and transmits a transfer request signal to the telephone line 50.
Is transmitted to the control circuit 14 of the user's home via
3) Wait for a response signal (S34).

As shown in FIG. 5, when there is an incoming interrupt request in the control main routine (S41), the control circuit 14 receives the transmitted signal (S42), and determines the received signal. (S43), a response signal is transmitted from the telephone line 50 to the network server 81 via the NCU 43 (S44). And the control circuit 1
4 transmits the accumulated history data relating to the operation status of the interconnected inverter device 16 and the amount of power generation and errors (S4).
5). When the transmission is completed (S46), the process returns to the original step before the interruption (S47).

As shown in FIG. 4, the network server 8
After receiving a response signal from the control circuit 14 in the user's home (S34), the control unit 1 receives the history data on the operating status, the amount of power generation, and the error transmitted from the control circuit 14 (S3)
5) and store it (S36). After the completion of the reception and the storage (S37), the operation ends.

FIG. 6 is a flowchart showing the general operation of the computer 92 of the power company 26, and FIG.
5 is a flowchart showing a schematic operation of the control circuit 14 of the interconnection inverter device 16 in response to an access from the user.

As shown in FIG. 6, the computer 92 of the electric power company 26 turns off the circuit breaker 22 in the service line 21 when an interruption of an accident occurs in the main routine (S51) (S52). Next, the telephone number of the user's home in the jurisdiction of the electric power company 26 is obtained by searching the database (S53), the telephone number is dialed without ringing (S54), and a transfer request signal is transmitted via the telephone line 50 to the user's home. (S55), and waits for reception of a response signal (S56).

As shown in FIG. 7, when there is an incoming call interruption in the control main routine (S71), the control circuit 14 receives the transmitted signal (S7).
2) The received signal is determined (S73), and the response signal is set to N
The data is transmitted from the telephone line 50 to the computer 92 of the power company 26 via the CU 43 (S74). Then, the control circuit 14 transmits the accumulated operation status data of the interconnection inverter device 16 (S75). When the transmission is completed (S76), the state shifts to a reception waiting state (S77).

As shown in FIG. 6, after the computer 92 of the power company 26 receives the response signal from the control circuit 14 in the user's house (S56), it receives the driving situation data transmitted from the control circuit 14 (S57). ) And memorize (S5)
8). The driving situation data is diagnosed (S59), and the level is determined (S60). When the level is 1, a stop signal is transmitted to the control circuit 14 in the user's house (S61), when the level is 2, a standby signal is transmitted (S62), and when the level is 3, a continuation signal is transmitted (S63). Then, it is determined whether or not there is a next user's house (S64). If there is, the process returns to step S53, and the same operation is repeated. If there is no next user's house, the process returns to the original step before the interruption (S65).

As shown in FIG. 7, when the stop signal is received (S78) in the reception waiting state (S77), the inverter circuit 13 is stopped (S78).
81), the switch 15 is turned off (S82). When the standby signal is received (S79), the switch 15 is turned off.
F (S82). When a continuation signal is received, nothing is performed. Then, the process returns to the original step before the interruption (S83).

As a modification of the above embodiment, the function of the main service company 60 may be provided by the service company 70 at each base. Alternatively, the network server 81 of the management company 80 and the computer 62 of the main service company 60 may be connected online, or the computer 92 of the power company 26 and the computer 62 of the main service company 60 may be connected online. Alternatively, the network server 81 of the management company 80 and the computer 92 of the power company 26 may be connected online. Further, the functions of the management company 80 may be controlled by the main service company 60. The telephone line 50 may be wired or wireless, or a dedicated communication line may be used instead of the public telephone line network.

[0038]

According to the photovoltaic power generation system interconnection network system according to the first aspect of the present invention, the switch is opened when an abnormality of the photovoltaic array or the interconnection inverter device is detected, whereby the photovoltaic array is connected. Since the entire constituent string is cut off from the inverter circuit and the inverter circuit is cut off from the distribution board, immediate security can be ensured. Further, error information can be automatically and in real time reported from a user's home to a predetermined company such as a service company via a communication line,
Maintenance and repairs can be implemented immediately.

According to the photovoltaic power generation system interconnection network system according to the second aspect of the present invention, a predetermined company such as a management company periodically or irregularly operates the interconnection inverter at a user's home via a communication line. By collecting the operation information of the device, it is possible to check the fluctuations in the amount of power generation and to check for signs of abnormality, etc., thereby providing a higher level of security and service.

According to the photovoltaic power generation system interconnection network system of the third aspect of the present invention, when an abnormality occurring in the commercial power system is dangerous, a predetermined company such as an electric power company can remotely control the system via a communication line. Since the inverter circuit is stopped by the control, high security can be ensured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a photovoltaic power generation system interconnection network system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a schematic operation of a control circuit of the interconnection inverter device in the embodiment.

FIG. 3 is a flowchart showing a schematic operation of a computer of a main service company in the embodiment.

FIG. 4 is a flowchart showing a schematic operation of a network server of a management company in the embodiment.

FIG. 5 is a flowchart illustrating a schematic operation of a control circuit of the interconnection inverter device in response to access from the network server in the embodiment.

FIG. 6 is a flowchart illustrating a schematic operation of a computer of a power company in the embodiment.

FIG. 7 is a flowchart illustrating a schematic operation of a control circuit of the interconnection inverter device in response to access from a power company in the embodiment.

FIG. 8 is a block diagram showing a schematic configuration of a conventional general photovoltaic power generation system interconnection system.

FIG. 9 is a block diagram showing a schematic configuration of a conventional photovoltaic power generation system interconnection system improved to notify a power company of an abnormality of the photovoltaic power generation system via a telephone line.

[Explanation of symbols]

 11 solar cell array 13 inverter circuit 14 control circuit 15 switch 16 interconnected inverter device 17 photovoltaic power generation system 18 commercial system 21 service line 22 circuit breaker 23 power meter 24 power distribution board 26 power company (predetermined business operator) 41 solar cell array sensor 42 inverter circuit sensor 43 NCU (transmitter / receiver) 50 telephone line (Communication line) 60: Main service company (predetermined company) 70: Service company (predetermined company) 80: Management company (predetermined company)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02N 6/00 H04M 11/00 301 H04M 11/00 301 H01L 31/04 K

Claims (3)

[Claims] 1. An inverter circuit for converting DC power generated by a solar cell array into AC power, a control circuit for controlling the inverter circuit, a circuit between the solar cell array and the inverter circuit, and an inverter circuit and a distribution board. A transmission / reception unit connected to a communication line is connected to the control circuit, and the control circuit includes a solar cell array or a connection inverter device. The photovoltaic power generation system is configured to open the switch when an abnormality is detected, and to transmit error information from the transmission / reception unit to a predetermined business operator via a communication line. System network system. 2. An inverter circuit for converting DC power generated by a solar cell array into AC power, a control circuit for controlling the inverter circuit, a circuit between the solar cell array and the inverter circuit, and an inverter circuit and a distribution board. A transmission / reception unit connected to a communication line is connected to the control circuit, and is connected to the control circuit via a communication line from a predetermined company. A photovoltaic power system interconnection network system configured to access a control circuit of the inverter device and collect operation information of the interconnection inverter device at a predetermined company. 3. An inverter circuit for converting DC power generated by a solar cell array into AC power, a control circuit for controlling the inverter circuit, a circuit between the solar cell array and the inverter circuit, and between the inverter circuit and the distribution board. A transmission / reception unit connected to a communication line is connected to the control circuit, and a predetermined business is performed when an abnormality occurs in a commercial system. A photovoltaic power generation system interconnection network system configured to access a control circuit of an interconnection inverter device from a user via a communication line and control the inverter circuit including stoppage.